You can avoid this change if, in _provision_package(), you determine package name and store it in context.package.arg.
If you decorate deb_local_package_query() with keyval_parse, then,  in _provision_package you could:
```python
context.package.arg = deb_local_package_query()['Package']
```

You may need to strip white space from the key in keyval_parse()